I bought this Car charger because I was going halfway across the U.S. and back, which is like a 60 hour trip. I knew I would be using my phone and laptop, so I bought this so I could charge both of them. It tends to fall out on the bumpy roads, but if you push it back in it won't fall out for about another hour.-treyrg
My test:
The USB and AC outlet both worked well to charge my cell phone. But when I plugged in my MacBook, it wouldn't charge. I thought something might be wrong with the Macbook cord, so I tried it on the Tripp Lite, and it didn't charge either! The Tripp Lite worked previously so I was almost sure the Macbook or its cord had the problem. When I got back home the Macbook charged fine on my home AC. So I went back to the car and plugged the Macbook into the Tripp Lite charging light comes on! Then the Bestek no light. Tripp Lite again no light! I waited a few minutes and tried the Tripp Lite again light comes on! The Bestek was doing something strange. I then use my Kill-a-Watt on the Bestek. Turns out the AC frequency fluctuates wildly during my short measurement I saw it briefly dip to 40 Hz. This is way too low and was probably causing issues with the Macbook (Tripp Lite was more stable and my brief test didn't show it dropping below 50 Hz). Power couldn't be the issue the Macbook adapter is rated at 60w max, so even if I add 10% as the Bestek instructions recommend, it's still below 75w. I have a 3rd gen Toyota Prius but I assume the DC ports act just like non-hybrids.
Note that other laptops probably would work, but mine didn't. Bottom line is that the low frequency is not acceptable because the standard is 50-60 Hz. I wonder if the other Bestek inverters have the same issue.
Other thoughts:
I like the compact form factor and the swiveling body; the latter helped with plugging it into confined DC ports like the one in the console box between the seats in the Prius. The AC outlet seemed a bit tight; when the Bestek was in the DC port and I wanted to remove an AC device, I was afraid my pulling would eventually damage the DC connector, or worse yet, the port. USB port was just the right tightness.I purchased the PROMOTION BESTEK 75Watt 12 Volt DC to 110-120 Volt AC Power Inverter With USB Adapter MRI711C-3 on a Thursday and it arrived on Saturday. I got this product for an inflatable bed I use when camping. I have not gone camping with it yet but I did inflate and deflate the bed I use two times in a row and it worked great, just as good as the wall outlets in my home. The unit was slightly warm to the touch after about ten minutes of continuous use but not warm enough to warrant any concern. Thus far this product has done what I got it for and it has done it well.I bought this charger for two reasons
1. I need an AC connection for attaching an electronic pump to blow up air mattresses for camping trips
2. To charge two iPhones/iPad on road trips
This charger does both very well! As I noticed in some other reviews, I did notice a faint electrical smell immediately after plugging it in, but that went away after a few minutes and I haven't noticed again. I highly recommend, especially for the price.When I received the unit, I was a little worried because I percieved a burning smell. But testing showed that it worked as advertized. I was able to power my tablet PC and also used the USB port for my GPS.
If I was going to change anything, it will be the size and shape. For some reason, plugging it to 12v DC port on my car was alittle challenging. In all, I am happy with the device.
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